AIRFLOW MEASUREMENT

The GF-A1000-DI airflow measurement device is a low cost, high performance, solution for airflow measurement in smaller round ducts. Designed for insertion mounting, the GF-A1000-DI is provided with an integral transmitter. Simply provide 24 VAC/DC power and connect the output cable wires to a BAS or other analog input device to determine the airflow rate. Available in aluminum or stainless steel. Fits 4 to 16 inch round ducts.

Features

Can be configured to provide the equivalent velocity pressure output in lieu of airflow

Thermal dispersion technology

Calibrated from 0 to 3,000 FPM

Stable bead-in-glass thermistor sensors

NIST traceable airflow and temperature measurement

Calibrated to volumetric airflow standards

Accurate and repeatable

Field calibration is not required

Fits standard 4 to 16 inch round ducts

Easy to install insertion probe design

Available in aluminum or stainless steel

Overview

The GF-A1000-DI airflow measurement device is a low cost, high performance, solution for airflow measurement in smaller round ducts. The GF-A1000-DI is provided with an integral transmitter. Simply provide 24 VAC/DC power and connect the output cable wires to a BAS or other analog input device to determine the airflow rate.

The GF-A1000-DI airflow measurement device is designed for duct insertion applications. Probes are available with one or two sensor nodes. Installed airflow accuracy is ±4% of reading to NIST traceable standards when installed in accordance to published placement guidelines.

The GF-A1000-DI measurement device uses the principal of thermal dispersion to determine the airflow rate. Thermal dispersion is ideal for HVAC applications that typically require measurement of low air velocities. Each sensing node uses two thermistors to determine airflow. One thermistor is self-heated above ambient while a second thermistor determines the ambient air temperature. The power dissipated into the airstream is directly related to the airflow rate.

Each thermistor body is a hermetically sealed bead-in-glass probe. Bead-in-glass thermistors have demonstrated extreme stability and superior performance over chip type thermistors used by other manufacturers. The bead-in-glass sensor used has been time tested for over 35 years by GreenTrol’s sister company, EBTRON. Thermistors are potted in a waterproof sensor assembly and are designed for years of trouble-free operation.

Each sensing node is individually calibrated at 7 points in high-performance wind tunnels. The transmitter processes each individual sensor node independently. The result is the true average airflow rate when more than one sensing node is applied.